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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3f3f71a7ff9a36d108849006505dfdc8e5f08761deed06ea0d1fc0e342fad5ef' 
  AND token = '1ksJRpywjtfluPIWj5SdL8bQCqFOntxGHR0cTgBADzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}